Lifecycle assessment of a system for food waste disposers to tank : A full-scale system evaluation

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Lifecycle assessment of a system for food waste disposers to tank : A full-scale system evaluation

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Publication Article, peer reviewed scientific
Title Lifecycle assessment of a system for food waste disposers to tank : A full-scale system evaluation
Author Bernstad Saraiva, Anna ; Davidsson, Åsa ; Bissmont, Mimmi
Date 2016
English abstract
An increased interest for separate collection of household food waste in Sweden has led to development of a number of different collection-systems - each with their particular benefits and drawbacks. In the present study, two systems for collection of food waste in households were compared; (a) use of food waste disposers (FWD) in kitchen sinks and (b) collection of food waste in paper bags for further treatment. The comparison was made in relation to greenhouse gas emissions as well as primary energy utilization. In both cases, collected food waste was treated through anaerobic digestion and digestate was used as fertilizer on farmland. Systems emissions of greenhouse gases from collection and treatment of 1 ton of food waste (dry matter), are according to the performed assessment lower from the FWD-system compared to the reference system (-990 and -770 kg CO2-eq./ton food waste dry matter respectively). The main reasons are a higher substitution of mineral nitrogen fertilizer followed by a higher substitution of diesel. Performed uncertainty analyses state that results are robust, but that decreasing losses of organic matter in pre-treatment of food waste collected in paper bags, as well as increased losses of organic matter and nutrients from the FWD-system could change the hierarchy in relation to greenhouse gas emissions. Owing to a higher use of electricity in the FWD-system, the paper bag collection system was preferable in relation to primary energy utilization. Due to the many questions still remaining regarding the impacts of an increased amount of nutrients and organic matter to the sewage system through an increased use of FWD, the later treatment of effluent from the FWD-system, as well as treatment of wastewater from kitchen sinks in the reference system, was not included in the assessment. In future work, these aspects would be of relevance to monitor. (C) 2016 Elsevier Ltd. All rights reserved.
DOI https://doi.org/10.1016/j.wasman.2016.04.036 (link to publisher's fulltext.)
Publisher Elsevier
Host/Issue Waste Management;
Volume 54
ISSN 0956-053X
Pages 169-177
Language eng (iso)
Subject Food waste disposers
Food waste
Collection system
Lifecycle assessment
Waste segregation
Energy balance
Sciences
Research Subject Categories::INTERDISCIPLINARY RESEARCH AREAS
Handle http://hdl.handle.net/2043/23040 Permalink to this page
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